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    SubjectRe: 2.6.22: oops in sbp2_remove_device
    On  1 Aug, Olaf Hering wrote:
    > This happens when attaching a firewire disk (momobay) to a single cpu
    > G5. I suspect there are two bugs, one is the error handling and one is
    > the DMA mask setting.
    > ieee1394: Node added: ID:BUS[0-00:1023] GUID[00010410100036e0]
    > ieee1394: Host added: ID:BUS[0-01:1023] GUID[000a95fffea65d66]
    > ReiserFS: sdb4: Using r5 hash to sort names
    > ieee1394: sbp2: failed to set 4GB DMA mask
    > Unable to handle kernel paging request for data at address 0x00000000
    > ...
    > NIP [d0000000002b48dc] .sbp2_remove_device+0x78/0x498 [sbp2]
    > LR [d0000000002b48c8] .sbp2_remove_device+0x64/0x498 [sbp2]
    > Call Trace:
    > [c00000000f1a3670] [d0000000002b48c8] .sbp2_remove_device+0x64/0x498 [sbp2] (unreliable)
    > [c00000000f1a3730] [d0000000002b5f38] .sbp2_probe+0x77c/0x7d4 [sbp2]
    > [c00000000f1a37e0] [c0000000002ca2a0] .driver_probe_device+0x13c/0x200

    I have now idea why dma_set_mask failed, nor do I see where the
    subsequent oops came from.

    From: Stefan Richter <>
    Subject: ieee1394: revert "sbp2: enforce 32bit DMA mapping"

    Revert commit 0555659d63c285ceb7ead3115532e1b71b0f27a7 from 2.6.22-rc1.
    The dma_set_mask call somehow failed on a PowerMac G5, PPC64:

    Should there ever occur a DMA mapping beyond the physical DMA range, a
    proper SBP-2 firmware will report transport errors. So let's leave it
    at that.

    Signed-off-by: Stefan Richter <>
    drivers/ieee1394/sbp2.c | 5 -----
    1 file changed, 5 deletions(-)

    Index: linux/drivers/ieee1394/sbp2.c
    --- linux.orig/drivers/ieee1394/sbp2.c
    +++ linux/drivers/ieee1394/sbp2.c
    @@ -773,11 +773,6 @@ static struct sbp2_lu *sbp2_alloc_device
    SBP2_ERR("failed to register lower 4GB address range");
    goto failed_alloc;
    - if (dma_set_mask(hi->host->device.parent, DMA_32BIT_MASK)) {
    - SBP2_ERR("failed to set 4GB DMA mask");
    - goto failed_alloc;
    - }

    Stefan Richter
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      Last update: 2007-08-01 20:33    [W:0.021 / U:108.940 seconds]
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